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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    A whistle with frequency \[1020\text{ }Hz\]is blown at a station. A man travelling in train moving towards the station at \[30\text{ }m/s\]hears the sound of the whistle. If the speed of sound is \[340\text{ }m/s,\] the apparent frequency heard by him is

    A)  \[1020\text{ }Hz\]          

    B)  \[1110\text{ }Hz\]

    C)  \[2040\text{ }Hz\]          

    D)  \[610\text{ }Hz\]

    Correct Answer: B

    Solution :

    Apart frequency \[n'=n\left[ \frac{v+{{v}_{0}}}{v} \right]\] \[n'=1020\left[ \frac{340+30}{340} \right]\] \[n'=1020\times 108.8\] \[n'=1110\,Hz\]


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